Improvement in stop-valves



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HENRY G. LUDLOW, OF TROY, AND. JABEZ STONE, OF WATERFORD, NEW

YORK, ASSIGNORS TO HENRY Gr'. LUDLOW.

Letters Patent No. 108,714, dated October 25, 1870.

IM PROVEMENT IN STOP-VALVES.`

The Schedule zcrred to in these Letters Patent and making pari: 0f the Bam declare the following to be a full, clear, and exact description thereof', reference being had to the accompanying drawing, which makes part of this specification, and in which- Figure 1 represents an elevation of a stop-valve einbracing our improvements Figure 2 represents a longitudinal section, showing the valve or gate c1osed;'.

Figure 3 represents a horizontal section, taken at the'lne :c of lig. 2; and Figure 4 represents an elevation of the valve, valve- Carrier, and its screw-stem.

Our invention relates to that class of stop-valves in which the stem is made to revolve only oil-its axis to produce a motion ofthe valve in opening and closing the saine; and

Our improvement consists of an indicator, in conneet-ion witlrsueh` a valve, operated by-the revolv-v ing motion of the valve-stem, in such manner as to indicate whether the valve is opened or closed, or to regulate and indicate any degree, ininches or fractions of an inch, to which it may be desired to open said valve. I

In the accompanying drawing- A represents the valve-box, having suitable openings, B C, for its, attachment to the engine and the escape-pipe, and is provided with arsci'ew-cap, D, through the opening for which the valve E and its carrying-plate F are inserted into their chamber in the box.

The revolving stenior sheath G of the valve passes into and through the cap D, and is' packed,

so as to render it steam-tight, by an annular rim, a, of an inverted cup, upon which it is supported, and' a stuIing-box, b, itted into and screwed upon the outer end of the cap:

The revolvingv stem yor sheath G is provided with van interior screw-thread, c, into which is fitted .a screw-stem, H, to which the valve-carrier Fis a t' tached. I

The hollow revolving stem vor sheath is prevented from having any movement in -thc direction of its lengthby the bearing of its annular rim, a, upon its'seat in the Valve-box, and a shoulder,- el, also upon the stein above the inverted cup a acting against the linner side of the screw-cap D.j ,1.

The turning of ,this stern to the right or left, therefore, causesfthe serew-steniiH-to move lengthwise within the revolving s tem or sheath G in opening and-closing lthe valve or gate.

The valve is closed upon its seatsby means o f invcliried, planes, j, on one side of the valve-chamber,

against whichtlie valve-carrier strikes inclosing said valve; and, as the latter andits carrier cannot turn MOH- within their chamber, nor the screw-stein upon the carrier, the valve must r'move in and out by simply low stem or sheath.

In order todetermine the position of the valve or gate, and to regulate the openingthereof, according to inches or fractions, we utilize the re-v volving motion of the hollow stem or sheath G, to operate au indicator divided into inches and fractions. This indicator consists of a toothed wheel, J, supported by a standard or an arm, K, on the cap, and matching into the threads of a worm, L, or other suitable device that will interlock with and communicatethe rotary motion of the sheath G tothe indicator.

The standard K, which supports the indicator, also forms a pointer or inilex-iinger,'e, for the graduated wheel.

The scale of inches may be arranged upon the wheel so as to be read either from its face or edge, as may be desired. The indicator may be supported in a standard s eplthe valve open.'

The rotary motion of the vworm L and its wheel J will in'dicate exactly the longitudinal movement of the screw-stem, and the extent of `the opening of the valve.

of a hollow sheath or stein, but to connect it with the interior screw-stein in vany manner that will operate the indicator by. a revolving motion. y

Having described our invention,

1. An indicator for determining aud'regulating' the position of a stop-valve or valves, operated by the ievolving motion of the stemv from whichthe valve deiive'sits opening and' closing movement, as herein described. f

2. The combination, substantially as described, of the revolving stem or sheathG of `a stop-valve, the worin L, and indicator J, for the purpose of indicating the position of said valve.

3. The combination ot' the valve-box A, the valve E, with'its carrier F, the' suspending screw-stemH,

hands.

HENRY Gr. LUDLOW. J ABEZ STONE.

Witnesses:v

LYMAN K. EDDY,

.'Eiinonus PORTER.

turning a' hand-wheel, I, on the outer end of the hol arate from the valve, and connected therewith in any We do not intend to confine ourselves to the use 

